I too am using OS X, and can't get a steady connection. It either connects or not, I just quit and try again.

When I do connect, it might even say Turbocharged, and I can run a search. It will pull up tons of files, but when I click download, it immediately goes down to excellent and fair then poor and I'm disconnected in less than a minute.

Interesting note, it disconnected the otherday, but I left it on and the file still downloaded. Very strange.

I've tried 3 different versions of Limewire, even paid for the Pro version, but nothing I've tried gets me connected on the first try and keeps me connected for any length of time.